<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Number</title>
    <script>
        // 所有的数都是Number类型，整数，小数
        var a = 123;
        var b = "123";
        console.log(a);
        // 检查数据的类型
        console.log(typeof b);

        // 数值最大，Number.MAX_VALUE
        // 超过这个值 Infinity(无穷大)
        console.log(Number.MAX_VALUE);
        //NaN:表示 Not a Number   它的类型也是 number

    </script>
</head>
<body>
    fd
</body>
</html>